Add -fdelete-null-pointer-checks to some C++ testcases.

These testcases were failing on nios2-elf, which defaults to
-fno-delete-null-pointer-checks.

2020-01-24  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/testsuite/
	* g++.dg/cpp0x/constexpr-odr1.C: Add -fdelete-null-pointer-checks.
	* g++.dg/cpp0x/constexpr-odr2.C: Likewise.
	* g++.dg/cpp0x/nontype4.C: Likewise.
	* g++.dg/cpp1y/constexpr-new.C: Likewise.
	* g++.dg/cpp1y/new1.C: Likewise.
	* g++.dg/cpp1y/new2.C: Likewise.
	* g++.dg/cpp2a/constexpr-dynamic11.C: Likewise.
	* g++.dg/cpp2a/constexpr-dynamic17.C: Likewise.
	* g++.dg/cpp2a/constexpr-dynamic4.C: Likewise.
	* g++.dg/cpp2a/constexpr-new1.C: Likewise.
	* g++.dg/cpp2a/constexpr-new10.C: Likewise.
	* g++.dg/cpp2a/constexpr-new2.C: Likewise.
	* g++.dg/cpp2a/constexpr-new3.C: Likewise.
	* g++.dg/cpp2a/constexpr-new4.C: Likewise.
	* g++.dg/cpp2a/constexpr-new8.C: Likewise.
	* g++.dg/cpp2a/constexpr-new9.C: Likewise.
	* g++.dg/cpp2a/nontype-class1.C: Likewise.

gcc/testsuite/ChangeLog

+2020-01-24  Sandra Loosemore  <sandra@codesourcery.com>
+
+	* g++.dg/cpp0x/constexpr-odr1.C: Add -fdelete-null-pointer-checks.
+	* g++.dg/cpp0x/constexpr-odr2.C: Likewise.
+	* g++.dg/cpp0x/nontype4.C: Likewise.
+	* g++.dg/cpp1y/constexpr-new.C: Likewise.
+	* g++.dg/cpp1y/new1.C: Likewise.
+	* g++.dg/cpp1y/new2.C: Likewise.
+	* g++.dg/cpp2a/constexpr-dynamic11.C: Likewise.
+	* g++.dg/cpp2a/constexpr-dynamic17.C: Likewise.
+	* g++.dg/cpp2a/constexpr-dynamic4.C: Likewise.
+	* g++.dg/cpp2a/constexpr-new1.C: Likewise.
+	* g++.dg/cpp2a/constexpr-new10.C: Likewise.
+	* g++.dg/cpp2a/constexpr-new2.C: Likewise.
+	* g++.dg/cpp2a/constexpr-new3.C: Likewise.
+	* g++.dg/cpp2a/constexpr-new4.C: Likewise.
+	* g++.dg/cpp2a/constexpr-new8.C: Likewise.
+	* g++.dg/cpp2a/constexpr-new9.C: Likewise.
+	* g++.dg/cpp2a/nontype-class1.C: Likewise.
+
 2020-01-24  Jason Merrill  <jason@redhat.com>
 
 	* lib/target-supports.exp (check_effective_target_unsigned_char):

gcc/testsuite/g++.dg/cpp0x/constexpr-odr1.C

 // PR c++/92062 - ODR-use ignored for static member of class template.
 // { dg-do run { target c++11 } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 template<int> struct A {
   static const bool x;

gcc/testsuite/g++.dg/cpp0x/constexpr-odr2.C

 // PR c++/92062 - ODR-use ignored for static member of class template.
 // { dg-do run { target c++11 } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 template<int> struct A {
   static const bool x;

gcc/testsuite/g++.dg/cpp0x/nontype4.C

 // PR c++/56428
 // { dg-do compile { target c++11 } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 struct A { };
 

gcc/testsuite/g++.dg/cpp1y/constexpr-new.C

 // { dg-do compile { target c++14 } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 constexpr int *f4(bool b) {
   if (b) {

gcc/testsuite/g++.dg/cpp1y/new1.C

 /* { dg-do compile } */
 /* { dg-options "-O2 -fdump-tree-cddce-details" } */
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 #include <stdlib.h>
 

gcc/testsuite/g++.dg/cpp1y/new2.C

 /* { dg-do compile } */
 /* { dg-options "-O2 -std=c++17 -fdump-tree-cddce-details" } */
+/* { dg-additional-options "-fdelete-null-pointer-checks" } */
 
 #include <cstdio>
 #include <cstdlib>

gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic11.C

 // PR c++/88337 - Implement P1327R1: Allow dynamic_cast/typeid in constexpr.
 // { dg-do compile { target c++2a } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 // dynamic_cast in a constructor.
 // [class.cdtor]#6: "If the operand of the dynamic_cast refers to the object

gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic17.C

 // PR c++/88337 - Implement P1327R1: Allow dynamic_cast/typeid in constexpr.
 // { dg-do compile { target c++2a } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 // dynamic_cast in a constructor.
 // [class.cdtor]#6: "If the operand of the dynamic_cast refers to the object

gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic4.C

 // PR c++/88337 - Implement P1327R1: Allow dynamic_cast/typeid in constexpr.
 // { dg-do compile { target c++2a } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 // From clang's constant-expression-cxx2a.cpp.
 

gcc/testsuite/g++.dg/cpp2a/constexpr-new1.C

 // P0784R7
 // { dg-do compile { target c++2a } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 struct S { constexpr S () : s (5) {} constexpr S (int x) : s (x) {} int s; };
 

gcc/testsuite/g++.dg/cpp2a/constexpr-new10.C

 // PR c++/91369
 // { dg-do compile { target c++2a } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 struct S {
   constexpr S (int* i) : s{i} {}

gcc/testsuite/g++.dg/cpp2a/constexpr-new2.C

 // P0784R7
 // { dg-do compile { target c++2a } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 template <int N>
 constexpr bool

gcc/testsuite/g++.dg/cpp2a/constexpr-new3.C

 // P0784R7
 // { dg-do compile { target c++2a } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 constexpr int *
 f1 ()

gcc/testsuite/g++.dg/cpp2a/constexpr-new4.C

 // P0784R7
 // { dg-do compile { target c++2a } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 struct S
 {

gcc/testsuite/g++.dg/cpp2a/constexpr-new8.C

 // PR c++/91369
 // { dg-do compile { target c++2a } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 struct A {
   constexpr A () : p{new int} {}

gcc/testsuite/g++.dg/cpp2a/constexpr-new9.C

 // PR c++/91369
 // { dg-do compile { target c++2a } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 struct S {
   constexpr S (int *i) : i{i} {}

gcc/testsuite/g++.dg/cpp2a/nontype-class1.C

 // { dg-do compile { target c++2a } }
+// { dg-additional-options "-fdelete-null-pointer-checks" }
 
 struct A
 {